Impact of State Ignition Interlock Laws on Alcohol-Involved Crash Deaths in the United States

Ignition interlock devices are designed to prevent intoxicated drivers from taking the wheel. Every state in the U.S. has a some form of ignition interlock law, and the Centers for Disease Control and Prevention has recommended a universal interlock requirement for all states. This article presents an analysis of the impact of a universal interlock requirement on alcohol-involved crash deaths. Using data from the National Highway Traffic Safety Administration for 1999 to 2013, the authors compare alcohol-involved crash deaths between 18 states with and 32 states without universal interlock requirements. Their results show, 3 years after implementation, an adjusted rate of alcohol-involved crash deaths of 4.7 per 100,000 in states with the universal interlock requirement (compared with 5.5 in states without). Ignition interlocks for all drunk-driving convictions is found to be associated with 15% fewer alcohol-involved crash deaths, compared with states with less-stringent requirements, leading the authors to conclude that interlocks are a life-saving technology.


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  • Accession Number: 01602107
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 4 2016 11:17AM